Microsoft is a technology corporation founded in 1975 that develops and sells operating systems, software, and services. It is best known for its Windows operating systems and Office software suite. Some key events in Microsoft's history include the launch of Windows 1.0 in 1985, dominating the personal computer market with over 90% usage share, and acquiring companies like LinkedIn and Nokia. Microsoft faces competition from companies like Apple, Google, and IBM in areas like operating systems, productivity software, cloud services, and games. It generates revenue primarily from sales of Windows, Office, the Xbox platform, and cloud services like Azure.